<template>
    <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb>
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item :to="{ path: '/home' }">商品管理</el-breadcrumb-item>
        <el-breadcrumb-item :to="{ path: '/goods' }">商品列表</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
             <el-alert title="添加商品信息" type="info" center show-icon ></el-alert>
             <!-- 步骤条 -->
             <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- 表单 -->
            <el-form :model="addCommodityForm " :rules="addCommodityRules" ref="addCommodityRef"
             label-width="100px" label-position="top">
                <!-- Tabs 标签页 -->
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="judgeClick"
                 @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addCommodityForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addCommodityForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addCommodityForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addCommodityForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader :options="CategoryList" :props="categoryProps"
                             @change="handleChange" v-model="addCommodityForm.goods_cat">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 多选框 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" :key="i" border></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item2.attr_name" v-for="item2 in onlyTableData" :key="item2.attr_id">
                            <el-input v-model="item2.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                      <el-upload :action="picsAction" :on-preview="handlePreview"
                      :on-remove="handleRemove" list-type="picture" :headers="picsHeaders"
                      :on-success="picsSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                      </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                      <!-- 富文本编辑器 -->
                      <quill-editor v-model="addCommodityForm.goods_introduce"></quill-editor>
                      <el-button type="primary" class="addBtn" @click="add">提交</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览框 -->
        <el-dialog title="图片预览" :visible.sync="picsVisible" width="50%">
          <img :src="picPath" alt="" class="picImg">
        </el-dialog>
    </div>
</template>

<script>
// 导入lodash依赖
import _ from 'lodash'
export default {
  data () {
    return {
      activeIndex: '0',
      // 存储商品信息
      addCommodityForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 商品所属的图片数组
        pics: [],
        // 商品所属介绍
        goods_introduce: '',
        // 商品的参数
        attrs: []
      },
      // 表单规则
      addCommodityRules: {
        goods_name: [
          { required: true, message: '请输入商品名称', trigger: 'blur' }
        ],
        goods_price: [
          { required: true, message: '请输入商品价格', trigger: 'blur' }
        ],
        goods_weight: [
          { required: true, message: '请输入商品重量', trigger: 'blur' }
        ],
        goods_number: [
          { required: true, message: '请输入商品数量', trigger: 'blur' }
        ],
        goods_cat: [
          { required: true, message: '请选择商品分类', trigger: 'blur' }
        ]
      },
      // 存储分类信息
      CategoryList: [],
      // 配置选项
      categoryProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片保存地址
      picsAction: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 请求头设置
      picsHeaders: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 保存点击图片后的图片预览地址
      picPath: '',
      picsVisible: false
    }
  },
  created () {
    this.getGoodsCategory()
  },
  methods: {
    // 获取商品分类
    async getGoodsCategory () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败')
      }
      this.CategoryList = res.data
      console.log(this.CategoryList)
    },
    // 当选中节点变化时触发
    handleChange () {
      console.log(this.addCommodityForm.goods_cat)
      if (this.addCommodityForm.goods_cat.length !== 3) {
        this.addCommodityForm.goods_cat = []
      }
    },
    // 切换标签之前的钩子，若返回 false 或者返回 Promise 且被 reject，则阻止切换。
    judgeClick (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addCommodityForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // tab 被选中时触发
    async tabClicked () {
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes`, {
                  params: {
                    sel: 'many'
                  }
                }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败')
        }
        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTableData = res.data
        console.log(this.manyTableData)
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(
                `categories/${this.cateId}/attributes`, {
                  params: {
                    sel: 'only'
                  }
                }
        )
        if (res.meta.status !== 200) {
          return this.$message.error('获取动态参数失败')
        }
        this.onlyTableData = res.data
        console.log(this.onlyTableData)
      }
    },
    // 点击图片显示事件
    handlePreview (file) {
      this.picPath = file.response.data.url
      this.picsVisible = true
    },
    // 删除图片事件
    handleRemove (file) {
      const path = file.response.data.tmp_path
      const i = this.addCommodityForm.pics.findIndex(x => x.pics === path)
      this.addCommodityForm.pics.splice(i, 1)
      console.log(this.addCommodityForm)
    },
    // 上传成功后的事件
    picsSuccess (response) {
      const path = response.data.tmp_path
      this.addCommodityForm.pics.push(path)
      console.log(this.addCommodityForm)
    },
    // 提交表单
    add () {
      this.$refs.addCommodityRef.validate(async val => {
        if (!val) {
          return this.$message.error('请填写所有带*号的内容')
        }
        // 循环动态参数列表数据获得 attr_id attr_value
        this.manyTableData.forEach(item => {
          const info = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addCommodityForm.attrs.push(info)
        })
        // 循环静态属性列表数据获得 attr_id attr_value
        this.onlyTableData.forEach(item => {
          const info = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addCommodityForm.attrs.push(info)
        })
        // cloneDeep 深度克隆
        const form = _.cloneDeep(this.addCommodityForm)
        form.goods_cat = form.goods_cat.join(',')
        form.attrs = this.addCommodityForm.attrs
        const { data: res } = await this.$http.post('goods', form)
        console.log(res)
        if (res.meta.status !== 201) {
          return this.$message.error(res.meta.msg)
        }
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    // 分类id
    cateId () {
      if (this.addCommodityForm.goods_cat.length === 3) {
        return this.addCommodityForm.goods_cat[2]
      }
      return null
    }
  }

}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0!important;
}
.picImg{
  width: 100%;
}
.addBtn{
  margin-top: 15px;
}
</style>
